Atomic Structure - Lesson 1

Who was the first person to think about an atom’s existence?

• Democritus

• John Dalton

• Ernest Rutherford

• J.J. Thompson

Which scientist discovered the electron?

• Eugene Goldstein

• J.J. Thompson

• Ernest Rutherford

• James Chadwick

Who used the gold foil experiment to discover the nucleus?

• J.J. Thompson

• Democritus

• John Dalton

• Ernest Rutherford

Where are protons located in an atom?

• In the electron cloud

• In the nucleus

• In the energy levels

• Outside the nucleus

Which scientist discovered the neutron?

• James Chadwick

• J.J. Thompson

• Ernest Rutherford

• Eugene Goldstein

According to Dalton's theory, atoms of the same element are:

• Mix or combine in whole number ratios

• Never change into another element

• Different from those of another element

• Identical

What did Ernest Rutherford conclude from the gold foil experiment?

• The particles in the gas were attracted to the positive plate

• The alpha particles hit a small, very dense, and positively charged center

• The atom is mostly empty space

• Atoms of different elements mix or combine in whole number ratios

Where are neutrons located in an atom?

• In the energy levels

• Outside the nucleus

• In the electron cloud

• In the nucleus

What are the 3 subatomic particles (particles that make up an atom)?

• proton, nucleus, and electron

• proton, neutron, and nucleus

• nucleus, neutron, and electron

• proton, neutron, and electron

What is the charge of a proton?

• positive

  +

• negative

  -

• neutral

  (no charge)